altoslib: Make AltosPreferencesBackend abstract. Add set/put Serializable

[fw/altos] / altoslib / AltosFrequency.java

diff --git a/altoslib/AltosFrequency.java b/altoslib/AltosFrequency.java
index 80e0d7247f8b6c3a904fa3ba89d48e6e61cdb22f..9542fe333858cdac0cbe715db08b1b4001cc41ed 100644 (file)
--- a/altoslib/AltosFrequency.java
+++ b/altoslib/AltosFrequency.java
@@ -17,7 +17,11 @@
 
 package org.altusmetrum.altoslib_10;
 
-public class AltosFrequency {
+import java.io.*;
+import java.util.*;
+import java.text.*;
+
+public class AltosFrequency implements Serializable {
        public double   frequency;
        public String   description;